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Old 05-22-2014, 06:27 AM   #1
Location: Spain

Join Date: Nov 2013
Posts: 28
Default Rename whole data sets

Hello! Sorry if my question seems a bit stupid, cause I think it has to be easy, but I don't have enough knowhow...
I want to rename a character string in R which contains numbers. It's something like this:

"3435" "4364" a.s.o.

I want to change that so there are words before the numbers. There must be the same words for the whole length of the object, like this:

"mygenes_3435" "mygenes_4364"...

is there a command to do this? Would it be similar if I wanted to rename a data.frame for example? I really need help, it's very urgent! =(

Last edited by IsBeth; 05-22-2014 at 06:54 AM.
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Old 05-27-2014, 08:11 PM   #2
Senior Member
Location: Pathum Thani, Thailand

Join Date: Nov 2009
Posts: 190

call that string MyString
NewString <- paste("mygenes_", MyString, sep="")

If that is a column of a data frame called DF
DF$MyString <- paste("mygenes_", DF$MyString, sep="")
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Old 05-28-2014, 12:24 AM   #3
Devon Ryan
Location: Freiburg, Germany

Join Date: Jul 2011
Posts: 3,480

Another option is sprintf:

NewString <- sprintf("mygenes_%s", MyString)
Paste is easier for concatenating two strings like this, but should you want to merge multiple things (possibly with formatting), then you'll find sprintf very helpful.
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